Malicious PDF — malware analysis report

Static analysis result for SHA-256 85380f43a50c37e1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 02:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb87234a8481f81578b391acb707e853 SHA-1: 15f7c82a4a8de22f8ec34a89115b5870a17dbaf8 SHA-256: 85380f43a50c37e1105ac0ec09a369c9e7c0f589a2c87a831aa7c0e108659f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928bb5ad8ae---34876462069.pdf In PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/gubedugukamix.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210731024405.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xovegotiwudototegazo.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/99104528759.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/1642501512.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be324665e9---87464415072.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9e63c974e5d4efbc1d6d8adb1f8588ca/29348501906.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/78960516151.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/80859035552.pdfIn PDF document text
    • https://sealskinz.ru/files/file/fivinefa.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/ripemusimotewurodugesa.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b21fbgseonvidqqo53e54ufk70/11763098090.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/311dedab346f5f14314e64bca4c094e4/16297415428.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s3qdruk5tbt3p48r16pb6h06l7/pagijire.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/2934392305.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b898aa08b9d782215fe69c7a1831e7b3/23344891369.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba754aaa0f---66639244940.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29e4da8ad---jikozewivovipamaletigobe.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/662010647.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/konejizitala.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161168b8d744c7---setepigufejarajabamofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=psoriasis+tratamiento+medico+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 18540 bytes
SHA-256: 721d5a4887d8bba9c71c56631af94b7fda849551a2e2c0da743068f7788fe0d0
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 10736 bytes
SHA-256: 4518f9b9d66dfd931f8284babd8329c32308d601c2b5e61fe08a22e830ed3c58
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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